基于动网格技术的潜艇热尾流浮升规律研究

Numerical simulation of thermal wake buoyant law based on dynamic meshing technique

针对基于相对运动的"排水法",无法全面、准确地反映潜艇热尾流浮升扩散规律,建立基于动网格技术的潜艇水下航行的二维计算模型,利用流体计算软件Fluent对潜艇排放过程中的流动-传热过程进行数值模拟。采用网格重构和网格光顺方法结合Profile运动边界驱动机制实现网格区域运动,确保模型符合实际运动规律。研究动网格技术和"排水法"热尾流最大浮升高度沿流向分布情况,最大浮升高度和中心温度随时间的变化规律。研究结果表明:动网格技术对于潜艇航行过程中的热尾流浮升过程有较高的计算精度;模拟结果捕捉到了浮升过程中流动和传热的瞬时变化,揭示了热尾流浮升扩散的规律。研究结果进一步为潜艇红外特征研究提供了理论支持和方法思路。

For the reason that the method based on the principle of relative motion is unable to reflect the buoyant law of submarine thermal wake comprehensively and accurately, 2D submarine voyage simulation model on the basis of dynamic meshes is developed for fluid flow and heat transfer of submarine thermal discharge by using Fluent. Smoothing methods and remeshing methods combined with Profile driven mechanism is applied in mesh zone movement. The varying tendency of thermal wake maximum rise height with x - axis, the variation of the maximum rise height and central temperature with time is analyzed. The result shows that the model has satisfactory precision on the buoyant process. The transient change of fluid flow and heat transfer are obtained by the numerical simulation which reveal the rising and diffusion law of thermal wake. The results can give theoretical support and research method for thermal infrared stealth study.